Commit Message

I hit a case where we were splitting a set of (const (unspec [...]))
into something that still referred to the original expression.
We reused that same expression as a REG_EQUAL note, leading to
an rtx-sharing violation.
Tested on mips64-linux-gnu and applied.
Richard
gcc/
* recog.c (split_insn): Copy the original SET_SRC before using
it as a note.